<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>函数返回值和函数表达式</title>
	</head>
	<body>
		<script type="text/javascript">
			// addition(加法) subtraction(减法)  multiplication(乘法)  
			function addition(a,b){
				var r = a + b;
				return r;
			}
			function subtraction(a,b){
				a - b;
			}
			function multiplication(a,b) {
				a * b;
			}
			function division(a,b){
				a / b;
			}
			
			var r = addition(3,2);
			console.log(r);
		</script>
	</body>
</html>
